Philip Tattershall
Yes, I have used this system but it was about 50 years ago(!) on a permanent club layout without baseboard joins. These days I use electrical methods either with commercial point motors or servos where you just need to take wires across the baseboard join.
With Mercontrol I would probably try to have a sliding item (like a pcb sleeper sliding between woodscrews) with a vertical peg in it on either side of the join and place a piece of strip with a couple of holes drilled in it over the two pegs so that the strip could be removed when the boards were separated.
Hope this helps
Phil